- Replace INCLUDES with AM_CPPFLAGS
(INCLUDES has been replaced by AM_CPPFLAGS and is deprecated in
modern automakes for several years)
- Require autoconf-2.61 and automake-1.10
(already required by autogen.sh)
- update mkinstalldirs with the version from automake-1.10
(The version in rpm is ancient and known to be bugged)
Patch from Ralf Corsepius